Gravity liquid separation of certain iron ores.



e p STATES PATENT OFFICE.

FRANCIS I. DU FONT, or WILMING'IlbN; DELAWARE.

GRAVITY LIQUID SEPARATION OF CERTAIN IRON ORES.

Specification of Letteis Patent ow Patented Sept. 12, 1911..

No Drawing. Application filed June 17, 1910, Serial No. 567,406. fietiewed February 14, 1911. Serial No.

To all whom it may concern:

Be it known that I, FRANCIS I. DUPONT, a citizen of the United States, residing at Wilmington, county of Newcastle, and State of Delaware, have invented a new and useful Improvement in Gravity Liquid Separation of Certain Iron Ores, of which the following is a full, clear, and eXact description.

My invention has for its object the separation by gravity liquid separation in limonite, hydrate of iron, of the metal constituents from the quartz or silicious material.

The object of my invention is to separate the constituents of such ores so that the re sultant iron constituent shall not contain silica in excess of that which is characteristic of a first class iron ore.

My process, generally speaking, consists oxid of iron Fe,() which is of greater specific gravity than the liinonite or original ore.

()n the other hand, the carried silica is not changed in specific gravity by theheating. The material is then subjected to separation in av tank containing as the separating liquid antimony bromid maintained substantially at an even temperature of 100 C.

The method of my in ention is carried out in the following manri er: The ore, preferably finely divided, is subjected to heat, producing the result described. This material is then fed into the separating tank containing the separating liquid, antimony bromid. By gravity a separation of the good ore from the silicious and Waste material takes place. The different specific gravities between the two constituents cause an amount of silica which is characteristic of a good ore and which does not harmfully affect its value.

So far as the heating is concerned, it may be carried out in any furnace.

So far as the separation is concerned, an form ofjseparatingtank suitably surroun 7 ed or having provided a heating medium may be use,

Havingnow fully described my invention, .what I claim and desire to protectby Letters Patent ,isz

l. 'lhehereinbefore described method for concentiating those iron ores which are adapted to be changed in composition by heat, which consists in heating said ores, then subjecting said ores to a separating action in antimony bromid maintained as a liquid,

- 2; The hereinbefore described methodfor concentrating those iron ores which are adapted to be changed in composition by heat, which consists in heating said ores then subjecting said ores to a separating action in antimony bromidmaintained as a liquid and at a substantially constant temperature. i

In testimony of which invention,-I have hereunto set my hand, at Philadelphia, on this 15th day of June, 1910.

FRANCIS I. DU PONTQ Witnesses:

M. M. HAMILTON,

A. M. URIAN. 

